fixed code samples in intro section
fixed code samples in The Graph section
added Groovy example for SubgraphStrategy
Merge branch 'master' into check-docs
fixed some typos
fixed code samples in The Traversal section
fixed code samples in The GraphComputer section
fixed code samples in the Gremlin Application section
fixed Neo4j code sample
Merge pull request #409 from dkuppitz/check-docs

cleaned up code samples in the docs